Posted by Fonda on Thursday, December 15, 2011 at 8:48pm.
Recent legislation limits g forces to 6 g's on roller coasters, for safety reasons. It makes no difference if it "negative" (up), down or sideways.
See http://www.iaapa.org/industry/funworld/2003/Mar03/Features/G%20Forces/G%20Forces.html
This is not an answer that can be derived using physics alone. It was established by committee and legislated.
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